Shallow seismic-derived acoustic core logs
A small micro-computer system with analog-to-digital sampling intervals to 30 microseconds has been developed for field processing of shallow seismic data. This digitizing capability plus an absorption model for marine sediments has allowed the development of a system for predicting acoustic impedance versus travel time. Utilizing regional data tables for soil type versus acoustic impedance and absorption such as Hamilton and Bachman/sup 8/ has allowed for the actual prediction of soil type, density, and grain size as a function of depth. The prediction accuracy is closely related to the signal-to-noise (S/N) of the received data, while the depth of penetration and resolution is related to the seismic frequencies employed. The model is discussed in detail with two years of data examples versus actual core data from the Beaufort Sea and Vancouver offshore areas given for review. Application areas such as dredging, pipeline surveys, and material location for offshore construction are discussed. In addition, limitations and further signal processing requirements are reviewed.
- Research Organization:
- Caulfield Engineering
- OSTI ID:
- 6162324
- Report Number(s):
- CONF-8405208-
- Journal Information:
- Proc., Annu. Offshore Technol. Conf.; (United States), Journal Name: Proc., Annu. Offshore Technol. Conf.; (United States) Vol. 2; ISSN OSTCB
- Country of Publication:
- United States
- Language:
- English
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42 ENGINEERING
423000 -- Engineering-- Marine Engineering-- (1980-)
ABSORPTION
ANALOG-TO-DIGITAL CONVERTERS
ARCTIC OCEAN
BEAUFORT SEA
COMPUTERS
CONSTRUCTION
CRYSTAL STRUCTURE
DATA PROCESSING
DENSITY
DEPTH
DIMENSIONS
DREDGING
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EQUIPMENT
FORECASTING
FREQUENCY DEPENDENCE
GRAIN SIZE
MICROELECTRONIC CIRCUITS
MICROPROCESSORS
MICROSTRUCTURE
PHYSICAL PROPERTIES
PIPELINES
PROCESSING
RESOLUTION
SAMPLING
SEAS
SEDIMENTS
SEISMIC SOURCES
SIGNAL-TO-NOISE RATIO
SIZE
SOILS
SONIC LOGGING
SURFACE WATERS
TIME DEPENDENCE
WELL LOGGING